Consider the following statements regarding the ultrastructure of the nucleolus and choose the correct answer:
1. The matrix or pars amorpha of the nucleolus is heterogeneous
2. The chromatin is Feulgen positive
3. The fibrils, 80 - 100 A in diameter, contain RNA and are probably the precursors of the granules
4. Ribonucleoprotein granules make up the pars granulosa

A. Only 1, 2 and 3 are true

B. Only 2, 3 and 4 are true

C. Only 3 and 4 are true

D. 1, 2, 3 and 4 are true

Answer: Option B